Home / 31,001.19-42,802.77-20,807.51

Finding the Fourth Proportional to 31,001.19, 42,802.77 and 20,807.51

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Solution

The fourth proportional to 31,001.19, 42,802.77 and 20,807.51 is: 28,728.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,001.19 : 42,802.77 = 20,807.51 : x
  2. Step 2: Convert to fraction form
    31,001.19/42,802.77 = 20,807.51/x
  3. Step 3: Cross multiply
    31,001.19x = 42,802.77 × 20,807.51
  4. Step 4: Simplify right side
    31,001.19x = 890,618,957.80
  5. Step 5: Solve for x
    x = 890,618,957.80/31,001.19
  6. Step 6: Final answer
    x = 28,728.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.